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References: <20200326152629.29272-1-stefan.ghinea@windriver.com> <20200326191628.GC5401@localhost>
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From: "Andre McCurdy" <armccurdy@gmail.com>
Date: Thu, 26 Mar 2020 12:53:08 -0700
Message-ID: <CAJ86T=WJ4+8Ly59gxj6maeLQC5NAcZiM-G+uKqhTTi3u9C_FtQ@mail.gmail.com>
Subject: Re: [OE-core] [PATCH] pulseaudio: fix for ARM thumb + frame pointers compilation error
To: Adrian Bunk <bunk@stusta.de>
Cc: Stefan Ghinea <stefan.ghinea@windriver.com>, 
	OE Core mailing list <openembedded-core@lists.openembedded.org>
Content-Type: text/plain; charset="UTF-8"

On Thu, Mar 26, 2020 at 12:16 PM Adrian Bunk <bunk@stusta.de> wrote:
>
> On Thu, Mar 26, 2020 at 05:26:29PM +0200, Stefan Ghinea wrote:
> >...
> > When compiling for Thumb or Thumb2, frame pointers _must_ be disabled
> > since the Thumb frame pointer in r7
> >...
>
> How are you reproducing the problem in pulseaudio?
>
> This sounds like a workaround for a bug in musl that was fixed 2 years ago.

The problem can show up anywhere that inline asm is trying to use r7.
In this case it looks like:

  https://github.com/pulseaudio/pulseaudio/blob/master/src/pulsecore/remap_neon.c#L50

Better fix there might be to use registers { r4,r5,r6,r12 } instead of
{ r4,r5,r6,r7 } ?

> cu
> Adrian
>